<template>
  <div class="image-list">
    <div class="action-head">
      <el-radio-group v-model="collect" size="mini" @change="loadIamges(1)">
        <!-- 不建议这么直接监听具体的按钮,会发两次请求
          <el-radio-button label="全部" @click.native="loadIamges(false)"></el-radio-button>
          <el-radio-button label="收藏" @click.native="loadIamges(true)"></el-radio-button>
          -->
        <!-- 以下也不对,发送两次请求 -->
        <!-- <el-radio-button :label="false" @click.native="loadIamges(false)">全部</el-radio-button>
          <el-radio-button :label="true" @click.native="loadIamges(true)">收藏</el-radio-button> -->
        <el-radio-button :label="false">全部</el-radio-button>
        <el-radio-button :label="true">收藏</el-radio-button>
      </el-radio-group>
      <el-button v-if="isShowAdd" size="mini" type="success" @click="dialogUploadVisible = true">上传素材</el-button>
    </div>
    <!-- 素材列表 -->
    <el-row :gutter="10">
      <el-col :xs="12" :sm="6" :md="6" :lg="4" v-for="(img,index) in images" :key="index" class="image-item" @click.native="selected = index">
        <el-image style="height: 100px" :src="img.url" fit="cover"></el-image>
        <div class="selected" v-if="isShowSelected && selected === index"></div>
        <div v-if="isShowAction" class="image-action">
          <!--
            class 样式绑定
             {
                CSS类名: 布尔值
             }
             true：作用类名
             false：不作用类名
           -->
          <el-button type="warning" :icon="img.is_collected ? 'el-icon-star-on' : 'el-icon-star-off'" circle size="small" @click="onCollect(img)" :loading="img.loading"></el-button>
          <el-button size="small" type="danger" icon="el-icon-delete-solid" circle :loading="img.loading" @click="onDelete(img)"></el-button>
          <!-- <i :class="{'el-icon-star-on':img.is_collected,'el-icon-star-off':!img.is_collected}" @click="onCollect(img)"></i>
            <i class="el-icon-delete-solid"></i> -->
        </div>
      </el-col>
    </el-row>
    <!-- 素材列表 -->

    <!-- 数据分页 -->
    <!--分页数据改变以后,页码不会变化,它需要单独处理高亮的页码-->
    <el-pagination background layout="prev, pager, next" :total="totalCount" :page-size="pageSize" :current-page.sync="page" @current-change="onPageChange">
    </el-pagination>
    <!-- 数据分页 -->

    <el-dialog title="上传素材" :visible.sync="dialogUploadVisible" :append-to-body="true">
      <!--
        upload 组件本身就支持请求提交上传操作，说白了你使用它不用自己去发请求，它会自己发。
        请求方法：默认就是 POST
        请求路径：action，必须写完整路径
        请求头：headers
       -->
      <el-upload class="upload-demo" drag action="http://api-toutiao-web.itheima.net/mp/v1_0/user/images" :headers="uploadHeaders" name="image" multiple :show-file-list="false" :on-success="onUploadSuccess">
        <i class="el-icon-upload"></i>
        <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
        <div class="el-upload__tip" slot="tip">只能上传jpg/png文件,且不超过500kb</div>
      </el-upload>
    </el-dialog>
  </div>
</template>

<script>
import { getImages, collectImage, deleteImage } from '@/api/image'

export default {
  name: 'ImageList',
  components: {},
  // 使用对象的方式定义 prop,更严谨,功能更丰富,强烈建议在项目中使用,
  // 参考文档：https://cn.vuejs.org/v2/guide/components-props.html#Prop-%E9%AA%8C%E8%AF%81
  props: {
    foo: {
      type: Number,
      // required: true,
      default: 123
    },
    // 是否显示添加素材
    isShowAdd: {
      type: Boolean, // 布尔值
      default: true // 默认值
    },

    // 是否显示图片下方的操作（收藏和删除）
    isShowAction: {
      type: Boolean,
      default: true
    },

    // 是否展示选择
    isShowSelected: {
      type: Boolean,
      default: false
    }
  },
  // 使用数组声明 prop，不建议，不够严谨，而且功能也不够强大，仅适合 demo 演示
  // props: ['dsadsadsa'],
  data() {
    const user = JSON.parse(window.localStorage.getItem('user'))
    return {
      collect: false, // 默认查询全部素材列表
      images: [], // 图片素材列表
      dialogUploadVisible: false,
      uploadHeaders: {
        Authorization: `Bearer ${user.token}`
      },
      totalCount: 0, // 总数据条数
      pageSize: 10, // 每页大小
      page: 1, // 当前页码
      selected: null // 选中的索引
    }
  },
  created() {
    // 页面初始化加载第1页数据
    this.loadIamges(1)
  },
  methods: {
    loadIamges(page = 1) {
      // 重置高亮页码,防止数据和页码不对应
      this.page = page
      getImages({
        collect: this.collect,
        page,
        per_page: this.pageSize
      }).then(res => {
        const results = res.data.data.results
        results.forEach(img => {
          // img 对象本来没有 loading 数据
          // 我们这里收到的往里面添加该数据是用来控制每个收藏按钮的 loading 状态
          img.loading = false
        })
        this.images = results
        this.totalCount = res.data.data.total_count
      })
    },
    // onCollectChange() {
    //   this.loadIamges(1)
    // },
    onUploadSuccess() {
      // 关闭对话框
      this.dialogUploadVisible = false

      // 更新素材列表
      this.loadIamges(this.page)

      this.$message({
        type: 'success',
        message: '上传成功'
      })
    },

    onPageChange(page) {
      this.loadIamges(page)
    },

    onCollect(img) {
      // 展示 loading
      img.loading = true
      collectImage(img.id, !img.is_collected).then(res => {
        // 更新视图状态
        img.is_collected = !img.is_collected
        // 关闭 loading
        img.loading = false
      })
      // if (img.is_collected) {
      //   // 已收藏，取消收藏
      //   collectImage(img.id, false)
      // } else {
      //   // 没有收藏，添加收藏
      //   collectImage(img.id, true)
      // }
    },

    onDelete(img) {
      img.loading = true
      deleteImage(img.id).then(res => {
        // 重新加载数据列表
        this.loadImages(this.page)
        img.loading = false
      })
    }
  }
}
</script>

<style lang='less' scoped>
.action-head {
  padding-bottom: 20px;
  display: flex;
  justify-content: space-between;
}

.image-item {
  position: relative;
}

.image-action {
  font-size: 25px;
  display: flex;
  justify-content: space-evenly;
  align-items: center;
  color: #fff;
  height: 40px;
  background-color: rgba(204, 204, 204, 0.5);
  position: absolute;
  bottom: 4px;
  left: 5px;
  right: 5px;
}

.selected {
  background: url(./selected.png) no-repeat;
  background-size: cover;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}
</style>
